Electric heater



FIG. 1 is a right perspective view of an electric heater showing my new design;

FIG. 2 is a front elevation view of the invention illustrated in FIG. 1;

FIG. 3 is a rear elevation view of the invention illustrated in FIG. 1;

FIG. 4 is a left elevation view of the invention illustrated in FIG. 1;

FIG. 5 is right elevation view of the invention illustrated in FIG. 1;

FIG. 6 is a top plan view of the invention illustrated in FIG. 1; and,

FIG. 7 is a bottom plan view of the invention illustrated in FIG. 1. 

The ornamental design for an electric heater, as shown and described. 